[MENTION=66589]daniell[/MENTION], I have had the Hypershot 350 for a few months. The battery lasts longer than I expected, though I don't remember how long, maybe three or four hours. I can't say how it compares with the other models. I feel I got my $50 worth. The problem with these safety devices is that you can never show that they do work. You can only say if they don't work, i.e. someone didn't see you even with the device. It's definitely the brightest taillight I've had, and it costs a lot less than a Dinotte light.